CN104679355B - A kind of optical touch screen and display device - Google Patents

Abstract

The present invention discloses an optical touch screen and a display device. The optical touch screen comprises: an array substrate having grid lines, data lines and common electrodes; further comprising: a plurality of touch reading signal lines extending in the same direction as the data lines; and A plurality of optical touch sensing units; wherein, the first control end of the optical touch sensing unit is connected to the first grid line, the second control end is connected to the second grid line, the input end is connected to the common electrode, and the output end is connected to the The touch reading signal line is connected; in this way, by setting an optical touch sensing unit in the optical touch screen, the optical touch sensing unit generates a corresponding optical touch signal according to the intensity of external light, and passes the generated optical touch signal through the touch The output of the control read signal line, and then determine the touch position on the optical touch screen according to the optical touch signal, so as to realize the optical touch detection of the optical touch screen.

Description

A kind of optical touch screen and display device

technical field

The invention relates to the technical field of touch screens, in particular to an optical touch screen and a display device.

Background technique

With the development of touch screen technology, touch technology has developed rapidly, and various companies implement touch display by introducing different touch technologies. According to the principle of touch technology, touch screens generally have the following types: resistive touch screen, capacitive touch screen, infrared touch screen, surface acoustic wave touch screen electromagnetic touch screen, vibration induction touch screen, frustrated total internal reflection optical induction, etc. According to the structure, there are mainly the following types of touch screens: out-cell touch screen (double layer), touch sensor on the coverage surface (single layer), touch sensor on the panel (on-cell), touch sensor on the Inside the panel (in-cell).

However, with the development of touch screen technology and market requirements, the thinning of the overall module is the market development trend, so the touch structure is developed from the touch sensor plug-in type to the touch sensor embedded type, so that the thickness of the touch panel can be reduced. Thin and greatly reduce the cost of the touch screen. Currently, there are mainly three types of in-cell touch panels: resistive touch panels, capacitive touch panels, and optical touch panels. Among them, the resistive touch panel belongs to the low-end sensing technology, and the product life is short; the capacitive touch panel is mainly suitable for small and medium sizes, and the optical touch panel is not limited in the use of the panel size, and the life is relatively stable, so the optical touch panel Control sensing technology has become the main sensing technology of the next generation touch technology.

Therefore, how to realize optical touch control on the basis of the existing touch panel is a technical problem to be solved urgently by those skilled in the art.

Contents of the invention

The embodiment of the present invention provides an optical touch screen and a display device, which are used to realize optical touch based on the existing touch panel.

An embodiment of the present invention provides an optical touch screen, including: an array substrate having gate lines, data lines, and common electrodes; An optical touch sensing unit; wherein,

The first control terminal of the optical touch sensing unit is connected to the first gate line, the second control terminal is connected to the second gate line, the input terminal is connected to the common electrode, and the output terminal is connected to the touch read signal line connected;

The optical touch sensing unit is configured to, according to the sensed ambient light intensity, set the The signal of the common electrode generates a corresponding electrical signal; when the second grid line is loaded with a grid line scanning signal, the signal of the common electrode is generated according to the intensity of external light and the corresponding electrical signal is passed through the touch reading signal line output.

In a possible implementation manner, in the optical touch screen provided by the embodiment of the present invention, the first grid line and the second grid line are two adjacent grid lines.

In a possible implementation manner, in the above-mentioned optical touch screen provided by the embodiment of the present invention, the optical touch sensing unit specifically includes: a photosensitive module and a control module; wherein,

The control end of the photosensitive module is connected to the first grid line, the input end is connected to the common electrode, and the output end is connected to the input end of the control module, which is used to load the first grid line to scan the grid line. signal, the signal of the common electrode is transmitted to the input terminal of the control module; during the time period after the first grid line is loaded with the grid scan signal and before the second grid line is loaded with the grid scan signal , generating a corresponding electrical signal from the signal of the common electrode according to the sensed external light intensity;

The control terminal of the control module is connected to the second gate line, and the output terminal is connected to the touch reading signal line, which is used to control the photosensitive module when the second gate line is loaded with a gate scan signal. The output electrical signal is transmitted to the touch reading signal line.

In a possible implementation manner, in the above-mentioned optical touch screen provided by the embodiment of the present invention, the photosensitive module specifically includes: a first switching transistor;

The gate of the first switching transistor is connected to the first gate line, the source is connected to the common electrode, and the drain is connected to the input terminal of the control module.

In a possible implementation manner, the above-mentioned optical touch screen provided by the embodiment of the present invention further includes: an opposite substrate disposed opposite to the array substrate, the opposite substrate has a black matrix and the first switch The region corresponding to the active layer of the transistor has a hollow pattern.

In a possible implementation manner, in the above-mentioned optical touch screen provided by the embodiment of the present invention, the control module specifically includes: a second switch transistor;

The gate of the second switching transistor is connected to the second gate line, the source is connected to the output terminal of the photosensitive module, and the drain is connected to the touch reading signal line.

In a possible implementation manner, in the above-mentioned optical touch screen provided by the embodiment of the present invention, the optical touch screen further includes: a signal amplification module and a touch position determination module; wherein,

The input end of the signal amplification module is connected to the touch reading signal line, and the output end is connected to the touch position determination module;

The signal amplification module is used to amplify the electrical signal on the touch reading signal line and output it to the touch position determination module;

The touch position determination module is used for determining the touch position on the optical touch screen according to the amplified electrical signal.

In a possible implementation manner, in the above-mentioned optical touch screen provided by the embodiment of the present invention, the electrical signal output by the optical touch sensing unit through the touch signal line is incremented in the following order: The optical touch sensing unit is irradiated strongly, the optical touch sensing unit is irradiated by ambient light, and the optical touch sensing unit is not irradiated by light.

In a possible implementation manner, in the above-mentioned optical touch screen provided by the embodiment of the present invention, the touch position determining module is specifically configured to: when it is determined that the received electrical signal is greater than the first preset value, determine that the The position where the touch occurs on the optical touch screen; when it is determined that the received electrical signal is less than the second preset value, determine the position where the laser pointer touches the optical touch screen; wherein the first preset value is greater than A reference value, the second preset value is smaller than the reference value, and the reference value is when ambient light irradiates the optical touch sensing unit, the optical touch sensing unit passes through the touch signal line The output electrical signal is the electrical signal value after being amplified by the signal amplification module.

An embodiment of the present invention provides a display device, including the above-mentioned optical touch screen provided by the embodiment of the present invention.

The beneficial effects of the embodiments of the present invention include:

An embodiment of the present invention provides an optical touch screen and a display device. The optical touch screen includes: an array substrate having gate lines, data lines, and common electrodes; , and a plurality of optical touch sensing units; wherein, the first control end of the optical touch sensing unit is connected to the first grid line, the second control end is connected to the second grid line, the input end is connected to the common electrode, and the output The terminal is connected to the touch reading signal line; the optical touch sensing unit is used to detect the external light according to the sensed external light during the time period after the first grid line is loaded with the grid line scanning signal and before the second grid line is loaded with the grid line scanning signal. The intensity generates the corresponding electrical signal from the signal of the common electrode; when the second grid line is loaded with the grid line scanning signal, the corresponding electrical signal is generated from the signal of the common electrode according to the sensed external light intensity and output through the touch reading signal line, In this way, by setting an optical touch sensing unit in the optical touch screen, the optical touch sensing unit generates a corresponding optical touch signal according to the intensity of external light, and outputs the generated optical touch signal through the touch reading signal line, and then The position where the touch occurs on the optical touch screen is determined according to the optical touch signal, so as to realize the optical touch detection of the optical touch screen.

Description of drawings

1-3 are schematic structural diagrams of optical touch screens provided by embodiments of the present invention, respectively;

FIG. 4 is a schematic diagram of an optical touch signal generated by an optical touch sensing unit corresponding to an external light intensity according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of the working stages of the optical touch screen provided by the embodiment of the present invention to realize optical touch.

detailed description

The specific implementation manners of the optical touch screen and the display device provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

An embodiment of the present invention provides an optical touch screen. As shown in FIG. 1 , it may include: an array substrate having gate lines, data lines 01 and common electrodes 02; Read the signal line 03, and a plurality of optical touch sensing units 04; wherein,

The first control terminal of the optical touch sensing unit 04 is connected to the first gate line 05, the second control terminal is connected to the second gate line 06, the input terminal is connected to the common electrode 02, and the output terminal is connected to the touch reading signal line 03 connected;

The optical touch sensing unit 04 is used to convert the signal of the common electrode 02 according to the sensed external light intensity during the time period after the first grid line 05 is loaded with the grid scan signal and before the second grid line 06 is loaded with the grid scan signal. Generate a corresponding electrical signal; when the second grid line 06 is loaded with a grid line scanning signal, the signal of the common electrode 02 will generate a corresponding electrical signal through the touch reading signal line 03 according to the sensed external light intensity.

In the above-mentioned optical touch screen provided by the embodiment of the present invention, by setting the optical touch sensing unit 04 in the optical touch screen, the optical touch sensing unit 04 generates a corresponding optical touch signal according to the intensity of external light, and the generated optical touch The signal is output through the touch reading signal line 03, and then the position of the touch on the optical touch screen is determined according to the optical touch signal, so as to realize the optical touch detection of the optical touch screen.

In a specific implementation, in the above-mentioned optical touch screen provided by the embodiment of the present invention, the optical touch sensing unit 04 may be located between two adjacent grid lines, or between two non-adjacent grid lines. This is not limited. As shown in Figure 1, the optical touch sensing unit 04 is arranged between two adjacent grid lines, that is, the first grid line 05 and the second grid line 06 are two adjacent grid lines, and the optical touch sensor The first control terminal of the sensing unit 04 is connected to the gate line of the Nth row, and the second control terminal is connected to the gate line of the N-1th row, so that the optical touch sensing unit 04 is connected to the gate line of the Nth row Under the control of row grid lines, it is time-divided to open, and during the time period after the N-th grid line is loaded with the grid-line scanning signal and before the N-1-th grid line is loaded with the grid-line scanning signal, the common electrode is turned on according to the sensed external light intensity. The signal of 02 generates a corresponding electrical signal; when the gate line of the N-1th row is loaded with a grid line scan signal, the signal of the common electrode 02 is generated and the corresponding electrical signal is output through the touch reading signal line according to the sensed external light intensity , to realize the optical touch function of the optical touch screen.

During specific implementation, in the above-mentioned optical touch screen provided by the embodiment of the present invention, in order to realize the function of the optical touch sensing unit 04 outputting the optical touch signal, as shown in FIG. 2 , the optical touch sensing unit 04 may specifically include : photosensitive module 041 and control module 042; wherein,

The control end of the photosensitive module 041 is connected to the first grid line 05, the input end is connected to the common electrode 02, and the output end is connected to the input end of the control module 042, for when the first grid line 05 is loaded with a grid line scanning signal, the common The signal of the electrode 02 is transmitted to the input terminal of the control module 042; in the time period after the first grid line 05 is loaded with the grid scan signal and before the second grid line 06 is loaded with the grid scan signal, the common The signal of electrode 02 generates a corresponding electrical signal;

The control terminal of the control module 042 is connected to the second gate line 06, and the output terminal is connected to the touch reading signal line 03, which is used to transmit the electrical signal output by the photosensitive module 041 when the second gate line 06 is loaded with a gate scan signal. to the touch read signal line 03.

Specifically, in the above optical touch screen provided by the embodiment of the present invention, the optical touch sensing unit 04 may include a photosensitive module 041 and a control module 042, wherein the photosensitive module 041 generates a corresponding signal from the common electrode 02 according to the sensed external light intensity. electrical signal, and output the corresponding generated signal as an optical touch signal to the input end of the control module 042; the control module 042 outputs the optical touch signal generated by the photosensitive module 041 through the touch reading signal line 03 to realize optical Optical touch for touch screens.

During specific implementation, in the optical touch screen provided by the embodiment of the present invention, in order to realize the function of the photosensitive module 041 to generate a corresponding electrical signal from the signal of the common electrode according to the sensed external light intensity, as shown in FIG. 2 , the photosensitive module 041, It may specifically include: a first switching transistor T1; the gate of the first switching transistor T1 is connected to the first gate line 05 , the source is connected to the common electrode 02 , and the drain is connected to the input terminal of the control module 042 .

Specifically, the type of the first switch transistor T1 is consistent with the type of the switch transistor in the pixel unit on the array substrate, and may be an N-type transistor or a P-type transistor, which is not limited herein.

When the first gate line 05 is loaded with the gate line scan signal, the first switch transistor T1 is in the conduction state, and the conduction first switch transistor T1 conducts the common electrode 02 with the input end of the control module 042, and then the common electrode 02 The electrical signal transmitted to the input terminal of the control module 042; at the same time, the first switching transistor T1 can generate a corresponding electrical signal, namely an optical touch signal, from the signal of the common electrode 02 according to the sensed external light intensity, and finally the signal at the input terminal of the control module 042 is The first switch transistor T1 corresponds to the generated optical touch signal according to the intensity of external light.

In specific implementation, in the above-mentioned optical touch screen provided by the embodiment of the present invention, the optical touch screen may further include: an opposite substrate disposed opposite to the array substrate, and the black matrix on the opposite substrate corresponds to the active layer of the first switching transistor. Features a cutout pattern.

Specifically, because the first switch transistor needs to generate a corresponding electrical signal, that is, an optical touch signal, from the signal of the common electrode according to the sensed external light intensity, the active layer material of the first switch transistor is a photosensitive material that is sensitive to light, and The position of the active layer of the corresponding first switch transistor cannot be blocked by the black matrix, so the black matrix area corresponding to the position of the active layer of the first switch transistor is set as a hollow pattern to avoid affecting the first switch due to the black matrix. Photosensitive function of transistor.

Wherein, the photosensitive material used in the active layer of the first switch transistor can be any material with photosensitive properties, and amorphous silicon material is generally used, because amorphous silicon material is sensitive to light, has good photosensitivity, and is When the optical touch screen provided by the embodiment of the present invention adopts the traditional amorphous silicon process, it is not necessary to add more process steps.

In specific implementation, in the above-mentioned optical touch screen provided by the embodiment of the present invention, in order to output the optical touch signal through the touch reading signal line 03, as shown in FIG. 2, the control module 042 may specifically include: a second switching transistor T2 ; the gate of the second switching transistor T2 is connected to the second gate line 06 , the source is connected to the output terminal of the photosensitive module 041 , and the drain is connected to the touch reading signal line 03 .

Specifically, the type of the second switch transistor T2 is consistent with the type of the switch transistor in the pixel unit on the array substrate, and may be an N-type transistor or a P-type transistor, which is not limited herein.

In this way, when the second gate line 06 is loaded with the gate line scanning signal, the second switch transistor T2 is in the conduction state, and the conduction of the second switch transistor T2 conducts the output terminal of the photosensitive module 041 with the touch reading signal line 03 , and then output the optical touch signal generated by the photosensitive module 041 to the touch reading signal line 03 to realize the output of the optical touch signal.

In specific implementation, in the above-mentioned optical touch screen provided by the embodiment of the present invention, as shown in FIG. 3 , the optical touch screen may further include: a signal amplification module 07 and a touch position determination module 08; wherein,

The input end of the signal amplification module 07 is connected to the touch reading signal line 03, and the output end is connected to the touch position determination module 08;

The signal amplification module 07 is used to amplify the electrical signal on the touch reading signal line 03 and output it to the touch position determination module 08;

The touch position determination module 08 is used to determine the touch position on the optical touch screen according to the amplified electrical signal.

Specifically, in the above-mentioned optical touch screen provided by the embodiment of the present invention, the optical touch sensing unit 04 generates a corresponding optical touch signal according to the intensity of external light, and outputs it through the touch reading signal line 03. In order to facilitate the identification of optical touch signal, the optical touch signal on the touch reading signal line 03 needs to be processed by the signal amplification module 07. Generally, the signal amplification module 07 is realized by an amplifier as shown in FIG. are the same and will not be described in detail here. In this way, the amplified optical touch signal is transmitted to the touch position determination module 08 , and the touch position determination module 08 determines the touch position on the optical touch screen according to the amplified optical touch signal.

In specific implementation, in the above-mentioned optical touch screen provided by the embodiment of the present invention, the electrical signal output by the optical touch sensing unit through the touch signal line increases in the following order: The unit is irradiated by ambient light to the optical touch sensing unit, and no light is irradiated to the optical touch sensing unit.

Specifically, as shown in FIG. 4, when ambient light irradiates the optical touch screen, the photosensitive module in the optical touch screen generates an optical touch signal value B corresponding to the intensity of ambient light; when a light intensity greater than ambient light irradiates the optical touch screen, The photosensitive module in the optical touch screen correspondingly generates an optical touch signal value C that is smaller than that generated under ambient light; Value A.

In this way, according to different light intensities, the optical touch screen generates corresponding optical touch signal values of different sizes, so that the touch position determination module can determine the position and method of touch on the optical touch screen according to different optical touch signal values.

During specific implementation, in the above-mentioned optical touch screen provided by the embodiment of the present invention, the touch position determination module can determine the position and method of touch on the optical touch screen in the following manner: after determining that the received electrical signal is greater than the first preset value , determine the position where the finger touches on the optical touch screen; when it is determined that the received electrical signal is less than the second preset value, determine the position where the laser pointer touches on the optical touch screen; wherein the first preset value is greater than The reference value, the second preset value is less than the reference value, the reference value is when ambient light irradiates the optical touch sensing unit, the electrical signal output by the optical touch sensing unit through the touch signal line is amplified by the signal amplification module electrical signal value.

Specifically, when the ambient light irradiates the optical touch screen, the optical touch signal value output by the optical touch sensing unit is amplified by the amplifying module as a reference value, and the first preset value is set based on the reference value and the second preset value, when the finger touch operation is equivalent to illuminating the optical touch screen with no light, when the laser pen touch operation is equivalent to illuminating the optical touch screen with strong light, the two touch operations correspond to generate different optical touch signal values, and then touch The control position determination module can determine the touch occurrence mode on the optical touch screen according to different optical touch signal values. In addition, the touch position determination module determines the touch occurrence position according to the position of the first grid line corresponding to the received signal. The abscissa is used to determine the ordinate of the position where the touch occurs according to the position of the touch reading signal line corresponding to the received signal.

It should be noted that the switch transistor mentioned in the above embodiments of the present invention may be a thin film transistor (TFT, Thin Film Transistor) or a Metal Oxide Semiconductor Field Effect Transistor (MOS, Metal OxideSmiconductor), which is not limited here. In specific implementation, the sources and drains of these transistors can be interchanged, and no specific distinction is made. When describing specific embodiments, a thin film transistor is taken as an example for illustration.

The working process of the optical touch screen will be described in detail below by taking the structure of the optical touch screen shown in FIG. 3 provided by the embodiment of the present invention as an example. The transistors in the optical touch screen shown in FIG. 3 are designed with N-type transistors, and the corresponding gate line scanning signals are high-level signals. Specifically, three stages t1 to t3 as shown in FIG. 5 are selected for description. In the following description, 1 represents a high-level signal, and 0 represents a low-level signal.

In the t1 stage, the gate line of the Nth row is loaded with the gate line scanning signal, so the first switching transistor T1 is in the conducting state, and then the common electrode and the source of the second switching transistor T2 are conducting, so the electrical signal of the common electrode is transmitted to the source of the second switching transistor T2. This phase is the reset phase.

In the t2 stage, neither the gate lines of the Nth row nor the gate lines of the N-1th row are loaded with the gate line scanning signal, so the first switching transistor T1 and the second switching transistor T2 are both in the cut-off state, and the first switching transistor T1 will be in accordance with The sensed external light intensity generates a corresponding electrical signal from the signal of the common electrode, that is, generates an optical touch signal corresponding to the external light intensity. This stage is the stage of optical touch signal generation.

In the stage t3, the gate line in row N-1 is loaded with the gate line scanning signal, so the second switch transistor T2 is in the conduction state, and the conduction state of the second switch transistor T2 conducts the source and the touch read signal line, Furthermore, the optical touch signal generated corresponding to the intensity of the external light is output through the touch reading signal line. This stage is the optical touch signal output stage.

Next, the optical touch signal is output to the signal amplification module through the touch reading signal line, and then output to the touch position determination module after being amplified by the signal amplification module, and then the touch position determination module determines the touch position on the optical touch screen And the method realizes the optical touch of the optical touch screen.

Based on the same inventive concept, an embodiment of the present invention provides a display device, including the above-mentioned optical touch screen provided by the embodiment of the present invention. The display device may be any product or component with a display function such as a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a navigator, and the like. Since the problem-solving principle of the display device is similar to that of the optical touch screen, the implementation of the display device can refer to the implementation of the optical touch screen, and repeated descriptions will not be repeated.

An embodiment of the present invention provides an optical touch screen and a display device. The optical touch screen includes: an array substrate having gate lines, data lines, and common electrodes; , and a plurality of optical touch sensing units; wherein, the first control end of the optical touch sensing unit is connected to the first grid line, the second control end is connected to the second grid line, the input end is connected to the common electrode, and the output The terminal is connected to the touch reading signal line; the optical touch sensing unit is used to detect the external light according to the sensed external light during the time period after the first grid line is loaded with the grid line scanning signal and before the second grid line is loaded with the grid line scanning signal. The intensity generates the corresponding electrical signal from the signal of the common electrode; when the second grid line is loaded with the grid line scanning signal, the corresponding electrical signal is generated from the signal of the common electrode according to the sensed external light intensity and output through the touch reading signal line, In this way, by setting an optical touch sensing unit in the optical touch screen, the optical touch sensing unit generates a corresponding optical touch signal according to the intensity of external light, and outputs the generated optical touch signal through the touch reading signal line, and then The position where the touch occurs on the optical touch screen is determined according to the optical touch signal, so as to realize the optical touch detection of the optical touch screen.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies thereof, the present invention also intends to include these modifications and variations.

Claims (9)

1. An optical touch screen comprising: an array substrate having a gate line, a data line and a common electrode; it is characterized by also comprising: a plurality of touch reading signal lines in the same extending direction as the data lines, and a plurality of optical touch sensing units; wherein,

a first control end of the optical touch sensing unit is connected with the first grid line, a second control end of the optical touch sensing unit is connected with the second grid line, an input end of the optical touch sensing unit is connected with the common electrode, and an output end of the optical touch sensing unit is connected with the touch reading signal line;

the optical touch sensing unit is used for generating a corresponding electric signal for the signal of the common electrode according to the sensed external illumination intensity in a time period from the moment when the first grid line loads the grid line scanning signal to the moment when the second grid line loads the grid line scanning signal; when the second grid line is loaded with the grid line scanning signal, generating a corresponding electric signal from the signal of the common electrode according to the sensed external illumination intensity, and outputting the electric signal through the touch reading signal line;

the optical touch sensing unit specifically includes: the device comprises a photosensitive module and a control module; wherein,

the control end of the photosensitive module is connected with the first grid line, the input end of the photosensitive module is connected with the common electrode, and the output end of the photosensitive module is connected with the input end of the control module, so that when a grid line scanning signal is loaded on the first grid line, a signal of the common electrode is transmitted to the input end of the control module; generating a corresponding electric signal for the signal of the common electrode according to the sensed external illumination intensity in a time period from the loading of the grid line scanning signal by the first grid line to the loading of the grid line scanning signal by the second grid line;

and the control end of the control module is connected with the second grid line, and the output end of the control module is connected with the touch reading signal line, and is used for transmitting the electric signal output by the photosensitive module to the touch reading signal line when the second grid line loads a grid line scanning signal.

2. The optical touch screen of claim 1, wherein the first gate line and the second gate line are two adjacent gate lines.

3. The optical touch screen according to claim 1, wherein the photosensitive module specifically comprises: a first switching transistor;

and the grid electrode of the first switching transistor is connected with the first grid line, the source electrode of the first switching transistor is connected with the common electrode, and the drain electrode of the first switching transistor is connected with the input end of the control module.

4. The optical touch screen of claim 3, further comprising: and the opposite substrate is arranged opposite to the array substrate, and a black matrix of the opposite substrate and an area corresponding to the active layer of the first switching transistor are provided with hollow patterns.

5. The optical touch screen according to claim 1, wherein the control module specifically comprises: a second switching transistor;

and the grid electrode of the second switching transistor is connected with the second grid line, the source electrode of the second switching transistor is connected with the output end of the photosensitive module, and the drain electrode of the second switching transistor is connected with the touch reading signal line.

6. The optical touch screen of any of claims 1-5, further comprising: the touch control device comprises a signal amplification module and a touch control position determination module; wherein,

the input end of the signal amplification module is connected with the touch reading signal line, and the output end of the signal amplification module is connected with the touch position determination module;

the signal amplification module is used for amplifying the electric signal on the touch reading signal line and outputting the amplified electric signal to the touch position determination module;

the touch position determining module is used for determining the position where touch control occurs on the optical touch screen according to the amplified electric signal.

7. The optical touch screen of claim 6, wherein the electrical signals output by the optical touch sensing unit through the touch signal lines are incremented in the following order: the light intensity greater than the ambient light irradiates the optical touch sensing unit, and no light irradiates the optical touch sensing unit.

8. The optical touch screen of claim 7, wherein the touch position determination module is specifically configured to: when the received electric signal is determined to be larger than a first preset value, determining the position of the finger on the optical touch screen where touch control occurs; when the received electric signal is determined to be smaller than a second preset value, determining the position of the laser pen, where touch control occurs, on the optical touch screen; the first preset value is larger than a reference value, the second preset value is smaller than the reference value, and the reference value is an electrical signal value obtained by amplifying an electrical signal output by the optical touch sensing unit through the touch signal line by the signal amplification module when the optical touch sensing unit is irradiated by ambient light.

9. A display device comprising an optical touch screen according to any one of claims 1 to 8.